I use screaming frog for my site. For some URLs it finds I don't know where it found those links.
This is an example image of my screaming frog:
Webmasters Stack Exchange is a question and answer site for pro webmasters. It only takes a minute to sign up.Sign up to join this community
It's in the "crawl path" report.
I found it via the third point in this article: 10 Features In The SEO Spider You Should Really Know | Screaming Frog